JPS5897953A - Data transmisson system of subscriber telephone circuit - Google Patents

Abstract

PURPOSE:To perform originating incoming at a terminal for the automatic inspection of a water-work meter, etc., and to obtain a simplified, high-reliability device, by using a common data transmission and reception sequence between the terminal and a center side. CONSTITUTION:A CPU1 controls a center network controller 3, which has a transmitting function for dial information necessary for a connection between a special trunk 8 and a terminal network controller 10, a transmitting and receiving function for various control signals, a receiving function for a call signal of 16Hz for terminal origination, a transmitting and receiving function for various control signals, and a modulating and demodulating function for data communication. Further, the trunk 8, fitted to an exchange 7, serves as a call side for a center side device or calling side for a terminal device 13 during center origination and has a no-ringing connection function for the device 10. Further, a common data transmission and reception sequence is employed after the terminal and center side are connected mutually.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides automatic meter reading information for water, gas, electricity, etc., as well as alarm signals for disaster prevention or crime prevention, over the telephone.
This invention relates to a data transmission system for subscriber telephone lines for IIIK transmission. 411, normal call operations (
The present invention relates to a data transmission system for subscriber telephone lines that allows data transmission without causing any hindrance.

In recent years, there has been a system in which a central device collects data from a terminal device in a remote location using a subscriber telephone line (hereinafter referred to as a "telephone line"), such as an automatic system that automatically reads the usage of lights, water, gas, electricity, etc. Meter reading systems are being put into practical use.

This type of data collection device uses a telephone line to transmit data during times when telephone calls are not being made. This rounded conventional device has a call priority function that does not interfere with calls, a no-ringing connection function that connects the telephone line without ringing the telephone bell during data transmission, and a telephone fgIal as an operating power source. It has main functions such as a station power supply function that operates with very small currents. Further, this type of telemeter device mainly has a terminal call reception function (polling) that activates the terminal device from the center device. In recent years, with the widespread use of telemeter devices, there has been a demand for devices that have not only a terminal call reception function but also a terminal transmission function (calling) for activating a center device from a terminal device. For example, reporting failure information for collecting sales volume information in vending machine management equipment, reporting when an abnormality occurs for regular condition monitoring in equipment management equipment, or automatic meter reading of ordinary household meters in the event of fire or theft. It is expected that the system will develop and expand into a variety of uses and services, such as reporting.

However, using the telephone line, the call was not received (polling)4.
When adding a terminal calling function to the first station, consideration must be given to the billing method as in the case of receiving a call from a terminal. Also, it is necessary to consider end-to-end signal transmission from the center to the terminal. , it is necessary to consider the frequency of the various control signals within the audio band. For this reason, the control signal is shared between the terminal incoming call and the terminal not calling. It is desirable to have the same To or sequence.

The present invention was developed against this background, and it is possible to receive a call from a terminal and not make a call, and moreover, it is possible to receive a call from a terminal without ringing, and to simplify the equipment by using a common sequence when transmitting signals. The purpose is to provide a remote control method that can be both automated and economical.

The present invention provides a data transmission terminal and control of this terminal.
A data transmission method in which a center-side device that collects data transmitted from this terminal is connected via a subscriber telephone line (a means for transmitting dial information to the center-side device and a call originating from the terminal). A telephone to which the terminal is connected, comprising a center network control device including means for transmitting signals and means for transmitting and receiving control signals and data, and a solid device for controlling the center network control device. The switching center accommodating the side is provided with a special trunk including a means for selective connection based on the dial information sent from the center network control device and for making a call connection without ringing the telephone bell of the called subscriber; On the terminal side of the subscriber telephone line to which the terminal is connected, a connection means for responding to an incoming call in response to a connection signal sent by the center network control device, a means for making a call from the terminal and automatically connecting to the center side device, and the center network control device A terminal network control device including a means for sending and receiving data transmission is connected to the side device, and data is sent from the center side device to the terminal network control device for connection made via the special trunk. The calling signal and the response signal sent from the center side device to the terminal network control device when the terminal makes a call and connects to the center side device are configured to be the same signal, The present invention is characterized in that the data transmission sequence δ after the terminal and the center side device are connected is the same even when the data transmission sequence δ is performed in the hf direction.

An embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the block diagram of the JII section according to an embodiment of the present invention. The solid equipment I is connected to the center network equipment 3 via a connection 112. This center network control eccentricity 3t
j It is connected to a switching center 5 via a telephone line 4 on the center side. This exchange 5 is connected to the exchange 7 on the terminal side via an inter-office relay 116. A special trunk 8 is connected to this exchange 7#'c. The exchange 7 is connected to a terminal network control device 10 via a terminal-side subscriber telephone line 9. A telephone 11 is connected to this terminal network control device lOK. Finally, a terminal device 13 is connected to this terminal network control device 10 via a connection 1112.

Here, it is a data processing unit (CPU) that controls the solid device IFi center network control device 3. Center network control device 3Fi functions for transmitting dial information necessary to connect the special trunk 8 and the terminal network control device 1O when making a call from the center and transmitting and receiving various control signals, and transmitting and receiving a vc16H7 call signal when making a call from the terminal. This device has reception and transmission/reception functions for various control signals, and a data communication modulation/demodulation function. Nine, the special trunk 8 is attached to the exchange 7,
When the center makes a call, the terminal network control device 1 becomes the called party for the center side device and the calling party for the terminal side device.
This is a device with zero ringing connection function. The terminal network control device 10 transmits the Seleta call* to the center network control device 3.
Receives a call signal when a no-ringing connection is commanded from
Furthermore, it has an automatic calling network control function that can perform data transmission, and an automatic calling function that can send a dial signal when receiving a calling request signal from the terminal device 13 and perform data transmission after the connection with the center side device is completed. This device also has network control functions. The terminal device 13 sends information to the terminal network control device 10.
This is a device that has the function of sending a call to the WCfd terminal network control device and requesting an OK call when emergency information occurs.

FIG. 2 is a diagram showing an operation sequence when a center call is made in the ninth embodiment shown in FIG. 1, and FIG. 5 is a diagram showing an operation sequence when a terminal call is made in the same embodiment.

With such a circuit configuration, characteristic operation 1 of the present invention Explain.

First, the operation when making a call from the center will be explained.

The solid equipment 1 issues a command to start meter reading to create the same conditions as the call from the spotter (Figure 2 (a)), and the exchange 6 detects this and dials a tone (1)? ) to return (
The solid equipment 1 transmits the special trunk 80 dial signal, and the exchange 5 Fi dial signal is sent to the inter-office trunk line 6.
70 incoming calls through the trunk
g Trunk) K is transmitted, the special trunk 8 is selected by the switching operation of the switching center 7, and a 16 Hz paging signal is sent. 411 When Tranta 8 returns a response, exchange 7Fi
Solid device IK: This is notified by polarity reversal, and the solid device I side is now connected to the special trunk 8 and in good condition. ((C) to (a) in the same figure) *Next, a control signal (mu signal) is sent from the solid equipment 1 to the special trunk 8, and the switching center 70
Input register R
r) and notifies the center of the response using the B signal (#I2 diagram (-) to (r)) *In this O state, the solid device 1 targets the special trunk 8 for data transmission. The subscriber number is sent along with the second dial signal, and the exchange 7
Then, the exchange operation is performed based on this signal. After the line connection between the center side and the terminal side is established, an activation signal is sent to the terminal network control device IO by reversing the polarity (WJ(g)). At this time, the exchange 7 does not send out a 16 Hz PEL signal.

Next, a calling signal (
0 signal) K activates the terminal network control device IO to complete the no-ringing connection (FIG. 2 (B)), and the terminal network control device IO returns a response signal (D signal) (FIG. 2 (B)).
i) ') @In this state, the solid device 1 and the terminal device 13 completely enter the data transmission mode.

Data is transmitted and received using signals 1 and 1 (eEl (j), axis) K in FIG. ((A) in the same figure, the exchange 7 releases the terminal network control device 10 (in the same figure)), this is K), the response signal (D signal) is also cut off ((n) in the same figure), and the The real device 1 cancels the call and ends everything ((0) in the same figure).

In this way, the no-ringing connection with zero originating flK is achieved by providing the special trunk 8 and the terminal network control device 10, and by combining the first dial and the second dial. First, the signals M~v are signals within the audio band.

Next, as shown in Fig. 3, regarding the operation when the evening end is not transmitted, aIjI
do. The terminal device 13Fi sends a call request signal to the terminal network control device 10 at an arbitrary time (FIG. 5(a'))
, the terminal network control device IO monitors the usage status of the telephone line 9, and if it is not in use, closes the DC loop and connects the terminal device 13Y.
- Send a calling signal ((b') in the same figure) 41 Next,
When the control device receives the selection dial information from the terminal device 13, it sends a dial signal to the exchange 7. The exchange 7 #-j dial signal is transmitted to the opposite exchange 5 via the inter-office trunk line 6. Based on the dial information, the exchange 6 selectively connects the telephone line 4 to which the center device is connected, and sends out a calling signal (1411z) ((0') in the figure).
When the center network control device 3 detects the calling signal, it creates a DC loop and responds. ((d') in the same figure) Furthermore, an AC signal (0') is sent out as a center response signal ((1!1') in the same figure).

When the exchange r4s detects a DC loop, the calling side (terminal) returns a polarity reversal signal to the exchange 7 to connect the line, and when the called side (center) charges, it sends a polarity reversal signal back to the exchange 5. The toll-free incoming trunk installed on the telephone line 4 side prevents this polarity reversal from being returned (see figure 1').
)) @ When the terminal network control device 10 receives this 11 property inversion signal and the center response signal (0') at the time of terminal charging, it sends out a response signal (D') (FIG. 5(f')).

At the time of center billing, when there is no polarity inversion signal, the center response signal (g') becomes a connection confirmation signal 9, and when this center response signal (g') is received, a response signal (D') is sent back (the same figure). (f')) In this state, the solid device l and the terminal device port completely enter the data transmission mode.

Next, the % data is sent and received using the E' and 1' signals in Figure 3 (tj1 (g'), (h')) @After data transmission is completed, a communication end command (y ') From K (Figure 1), the calling side terminal device 13 recovers the call request signal to the terminal network control device lOK, and the process ends (Figure 1).
).

In this way, if we compare the two sequences when calling from the center and when calling from a terminal, @- is connected and the signals C and O',
For D and D', l and V% ν and r, it is possible to use exactly the same signal, Ton, and the same path.

As explained above, (according to the present invention) it is possible to execute both terminal incoming calls and terminal outgoing calls, and to send and receive signals after the line between the center side and the terminal side has been connected, that is, no-ringing incoming calls. The sequence is the same after the ringing signal at the time and the response signal at the time of the terminal call.Therefore, the equipment can be shared, making the device economically configurable.
Improves device reliability4.

[Brief explanation of the drawing]

The first diagram is a block diagram of a main part of an embodiment of the present invention. FIG. 2 is a diagram showing an operation sequence when a call is made from the center in the above embodiment. FIG. 5 is a diagram showing an operation sequence when a terminal makes a call in the above embodiment. l... Solid device, 2... Connection line, 3... Center network control device, 4... Center side telephone line, 5... Originating station,
6...Inter-office trunk line, 7...Switching center, 8...Special trunk, 9--Line to terminal side block incoming call #%lO...Terminal network control device, ll...Telephone, 12・−・Connection line,
13--Terminal device. Center flight 1 lie 1 (+, 3) 2 mommeyo LLy 卜−
(5) , LLL (7) Father-in-law, supervisor, trout, mouth, 1 town, 1 ton Wo
o> 1 piece u (13) (CPU) (C-NCU)
(IσXNRη(IR) (ANR
-NCU) Figure 2 Figure 3 Continuation of page 1 0 Author: Takashi Nakagawara - 3-1-1 Asahigaoka, Hino City, Tokyo Shibaura Electric Buying Co., Ltd. Hino Factory 0 Author: Isamu Tsuruta 3-chome, Asahigaoka, Hino City No. 1 No. 1 Tokyo Shibaura Electric Co., Ltd. Hino Plant No. 1 No. 1, Tokyo Shibaura Electric Co., Ltd. Electric Co., Ltd. 72 Horikawa-cho, Saiwai-ku, Kawasaki City

Claims (1)

[Claims] (In a data transmission system in which a data transmission terminal and a center-side device that controls this terminal and collects data transmitted from this terminal are connected through a power supply line 111-), A means for transmitting dialing information, a means for receiving a ringing signal transmitted from the terminal, and a control signal and data O are provided to the side device.
an exchange 4 comprising a center network control device including means for transmitting and receiving data and a central device controlling the center network control device, and accommodating a telephone line to which the terminals are connected;
#C. 9 subscribers to which the above-mentioned terminals are connected; On the terminal side of the telephone line, a connection means for responding to an incoming call in response to a connection signal sent by the center network control device, a means for automatically connecting to the center device when a call is made from the terminal, and data communication between the center device and the center device. A terminal network control device including means for sending and receiving transmissions is connected thereto. A call signal sent from the center-side device to the terminal network control device for connection made via the special trunk, and a call signal sent from the center-side device to the terminal network control device when the terminal makes a call and connects to the center-side device. The configuration is such that the response signal sent from the side device to the terminal network control device is the same signal, and the data transmission sequence after the terminal and the center device are connected will eventually be in the O direction. 1. A data transmission system for subscriber telephone lines, characterized in that it is configured to be common to all four systems.